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Abstract

Dendritic tungsten photothermal devices (e.g., Applied Physics Letters, Vol. 76, No. 10, May 1975) have energy loss through the reemission of infrared radiation within a cone angle of about 36 degrees. A structure is described herein which reflects this radiation back into the tungsten surface with a reflecting substance which is not in contact with the tungsten.

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United States

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English (United States)

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Photothermal Device with Low Temperature Infrared Photon Recycling

Dendritic tungsten photothermal devices (e.g., Applied Physics Letters, Vol.
76, No. 10, May 1975) have energy loss through the reemission of infrared
radiation within a cone angle of about 36 degrees. A structure is described
herein which reflects this radiation back into the tungsten surface with a reflecting
substance which is not in contact with the tungsten.

The reemitted radiation can be captured with infrared reflecting substances
such as thin-metal films or films of SnInO(x) which are not in close proximity to
the solar energy absorbing surface. With black body absorbers, the infrared
reflectors have to be placed in close proximity in order to recapture efficiently the
infrared radiation. This usually results in excessive heating of the reflector which
degrades its reflecting properties. However, with the dendrite tungsten device,
this reflecting device can be more remote and hence less susceptible to
undesirable heating effects, and yet still recapture efficiently the infrared
radiation.